I give it to Foreman on actual head punching and physical strength. Tyson was second. Liston is in there. Frazier was 4th. I think Tua should not be considered. He really has not wiped out the top guys as a champion to be in that class. And the way he fights now the tomato cans he is fighting, he does not really want tough competition. The guy is good, but not in the championship tier. Why he is waiting so long to get going I do not get..